IBM VS. THE UNITED STATES, a case brought before the U.S. Supreme Court, set the precedent. The high court ruled that companies which engage in the practice of requiring or intimidating their customers into purchasing supplies or replacement parts from them exclusively create a "tying agreement" which was found to be in violation of Antitrust Laws. HEWLETT PACKARD clearly states in their warranty policy that "Hewlett Packard does not prohibit the use of refilled toner cartridges during the warranty period or under a maintenance contract. . ." DON'T BE AFRAID to show this document to any service person or OEM representative who inhibits or threatens your right to choose your own cartridge supplier. This recycled cartridge with NEW OPC belt will perform as well or better than the OEM's. KEEP AMERICA BEAUTIFUL. . . RECYCLE!